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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised		$ 17.4	$ 0.8
Unrecognized compensation costs	$ 6.3	$ 6.3
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)	0
Shares available for future issuance (in shares)	5,500,000	5,500,000
Term of options granted		10 years
Vesting period		4 years
Percentage of awards vesting each year		25.00%
Stock-based compensation costs		$ 2.5	$ 1.5
Weighted-average expected recognition period		2 years 5 months 12 days
Expected dividend rate		0.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average expected recognition period		2 years 9 months 25 days
Awards granted (in shares)		200,000	0
Awards vested and released from right to repurchase (in shares)		38,836	37,500
Awards cancelled (in shares)		0	0
Weighted average estimated fair value of awards granted (in shares)		$ 18.70
Unrecognized stock-based compensation	$ 4.0	$ 4.0

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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